If the government provides every citizen a hula-hoop then it follows that in economic terms:
A. hula hoops are a semi-public good as they are non rival but excludable
B. hula hoops are a semi-public good as they are rival but non-excludable
C. hula hoops are a private good as they are rival and excludable
D. hula hoops are a public good as they are non rival and non excludable